In simple terms, incentive traffic is the traffic channel in which visitors receive some form of compensation for doing action.Regard to mobile applications, incentive traffic is one of the most effective channels of traffic which allows to promote application to the top. This traffic channel is used in all promotion strategies. If you are interested in promoting mobile app I can recommend you Applead - https://applead.net/en/setupThis is a great service that specializes in mobile apps promotion

It is traffic that is given when people have a reason to go to your site, other then reading the regular contents.

For example, if I had showed a link to a gardening website, yet named the link "My gardening site has a free giveaway! $500 for anyone who clicks!", people would click the link wanting $500, not because they wanted to learn about. So things like contests, referal schemes etc cause incentive traffic -- traffic that goes to a site not because of its regular content, but because of an incentive.